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Changes in Capital Structure - Changes in NRG's Common Stock Issued and Outstanding (Details) - shares
 1 Months Ended 9 Months Ended
Mar. 09, 2023
Oct. 31, 2023
Sep. 30, 2023
Schedule of Stock by Class, Equity [Roll Forward]      
Common, Balance as of beginning of period (in shares)   424,908,449 423,897,001
Treasury, Balance as of end of period (in shares)   (195,571,596) (194,335,971)
Common, Outstanding, as of beginning of period (in shares)   229,336,853 229,561,030
Shares repurchased (in shares)     (1,322,141)
Preferred, Balance as of end of period (in shares)     650,000
Common, Balance as of end of period (in shares)     424,908,449
Treasury, Balance as of end of period (in shares)     (195,571,596)
Preferred, Outstanding as of end of period (in shares)     650,000
Common, Outstanding, as of end of period (in shares)     229,336,853
Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares repurchased (in shares)   (3,732,657)  
Common, Outstanding, as of end of period (in shares)   225,764,436  
Shares issued under LTIPs      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)     1,011,448
Shares issued under LTIPs | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)   55,507  
Shares issued under ESPP      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)     86,516
Shares issued under ESPP | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)   104,733  
Preferred Stock      
Schedule of Stock by Class, Equity [Roll Forward]      
Preferred, Balance as of end of period (in shares)     650,000
Preferred, Outstanding as of end of period (in shares)     650,000
Preferred Stock | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Preferred, Balance as of end of period (in shares)   650,000  
Preferred, Outstanding as of end of period (in shares)   650,000  
Preferred Stock | Series A Preferred Stock      
Schedule of Stock by Class, Equity [Roll Forward]      
Issuance of Series A Preferred Stock (in shares) 650,000   650,000
Common Stock      
Schedule of Stock by Class, Equity [Roll Forward]      
Common, Balance as of beginning of period (in shares)   424,908,449 423,897,001
Shares repurchased (in shares)     0
Common, Balance as of end of period (in shares)     424,908,449
Common Stock | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares repurchased (in shares)   0  
Common, Balance as of end of period (in shares)   424,963,956  
Common Stock | Shares issued under LTIPs      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)     1,011,448
Common Stock | Shares issued under LTIPs | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)   55,507  
Common Stock | Shares issued under ESPP      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)     0
Common Stock | Shares issued under ESPP | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)   0  
Treasury Stock      
Schedule of Stock by Class, Equity [Roll Forward]      
Treasury, Balance as of end of period (in shares)   (195,571,596) (194,335,971)
Shares repurchased (in shares)     (1,322,141)
Treasury, Balance as of end of period (in shares)     (195,571,596)
Treasury Stock | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares repurchased (in shares)   (3,732,657)  
Treasury, Balance as of end of period (in shares)   (199,199,520)  
Treasury Stock | Shares issued under LTIPs      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)     0
Treasury Stock | Shares issued under LTIPs | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under LTIPs (in shares)   0  
Treasury Stock | Shares issued under ESPP      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)     86,516
Treasury Stock | Shares issued under ESPP | Subsequent Event      
Schedule of Stock by Class, Equity [Roll Forward]      
Shares issued under ESPP (in shares)   104,733